The first thing you notice is that these are very nicely packaged rather than the typical plastic bags. They also come with both M-F jumper wires and F-F jumper wires. The sensors work as expected and the quality of the PCB looks good. Even the solder joints look great. I would buy these again.
EPLZON HC-SR04 Ultrasonic Module Distance Sensor fit for Arduino UNO MEGA Nano Robot XBee ZigBee (pack of 5 pcs)
4.8 | 59 ratings
Price: 9.99
Last update: 08-09-2024
About this item
✅EPLZON HC-SR04 Ultrasonic ranging transducer sensor
✅Test mode: Use IO to trigger high-level signals. (Not less than 10us), the module automatically sends 8 40kHz and detects whether there is a pulse signal return.
✅Detection area: 0.78~196 in/(2cm~500cm); high precision: up to 0.12 inch/(0.3 cm), effective angle: less than 15°; Trigger input pulse width: 10uS
✅Power supply: 5V DC; Quiescent current: less than 2mA;Dimension: 1.77 x 0.78 x 0.59 inches/45mm x 20mm x 15mm(length*width*height)
✅Test distance=((high level duration)*(sound wave: 340m/s))/2
✅Test mode: Use IO to trigger high-level signals. (Not less than 10us), the module automatically sends 8 40kHz and detects whether there is a pulse signal return.
✅Detection area: 0.78~196 in/(2cm~500cm); high precision: up to 0.12 inch/(0.3 cm), effective angle: less than 15°; Trigger input pulse width: 10uS
✅Power supply: 5V DC; Quiescent current: less than 2mA;Dimension: 1.77 x 0.78 x 0.59 inches/45mm x 20mm x 15mm(length*width*height)
✅Test distance=((high level duration)*(sound wave: 340m/s))/2
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Top reviews from the United States
Cecil Clontz
Great ultrasonic sensors for a very reasonable price
Reviewed in the United States on July 12, 2024Wayne Fernandez
Very good quality!!
Reviewed in the United States on May 14, 2024Amazon Customer
direct output to 5vdc relay
Reviewed in the United States on February 23, 2024Scott I.
Sensors Work As Expected
Reviewed in the United States on February 6, 2023
Todd K. Moyer
An inexpensive, well-made ranging module, great for hobbyists and experimenters.
Reviewed in the United States on February 21, 2023
Todd K. Moyer
Reviewed in the United States on February 21, 2023
The sensors do not come with a datasheet or instructions of any kind. An internet search for "HC-SR04" should work to find the datasheet.
I do think it may be frustrating to try to measure distances of 4-5 m, as is claimed for this module, unless you have a very specific, controlled environment that is free from objects that may confuse the sensor. I did confirm that it can measure distances down to about 20 mm, though it becomes critical to know precisely what the plane of the measurement is. I used the edge of the silver transducer enclosure, but the real transducer is buried inside. You may be able to calibrate that offset out, with some careful characterization.
Check out the attached oscilloscope screen shot to see the basic operation of this module. It only needs 4 connections, VCC/GND for power, and a trigger pulse input, which produces an echo pulse output. The echo pulsewidth is proportional to the distance between the module and the object being ranged.
The trigger pulsewidth does not seem to be critical, but it is specified to be 10 us minimum. I tried widths as low as 1 us and found that it worked reliably. At 500 ns, operation was intermittent. I would not recommend going below 10 us, per the datasheet. The 'scope photo shows a 1 ms trigger pulse. The echo pulse seems to consistently come 2.2 ms after the falling edge of the trigger pulse.
The 'scope photo scenario was measuring a distance of about 280 mm. My setup was not intended to produce very accurate distances, but to show the operation over a range of distances. The resulting echo pulsewidth was averaging 1.616 ms, which given the formula in the datasheet, leads to a distance measurement of 275 mm, which seems reasonable.
In my testing current consumption of the module was about 3 mA with a 5 V power supply.
Images in this review
Monte
Worked perfect for my auto-open project!
Reviewed in the United States on May 24, 2023MICHAEL O.
EASY to Use Proximity Sensor
Reviewed in the United States on November 5, 2022Bobby Santos
Each one worked as expected.
Reviewed in the United States on May 3, 2023